P0420 trouble code Toyota Corolla 1995

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  • greguk
    Community Member
    January 19, 2021 at 3:03 pm

    Hi I have a p0420 code with a check engine light in my toyota corolla. Tried to reset the codes two times but it keeps coming back. what could be the problem?

    MSelleen
    Administrator
    January 19, 2021 at 5:28 pm
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    Check your catalytic converter and make sure your engine is not burning any oil.

    You can find more information about how you can do it in our complete article about the P0420 trouble code here:

    https://mechanicbase.com/trouble-code/p0420/

    old garage mechanic
    Community Member
    November 10, 2021 at 10:36 pm
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    On all cars made after 1995, there are 2 types of oxygen sensors,  code PO420 has to do with the exhaust. what is referred to as an “upstream” and “downstream” sensor. The upstream sensor does most of the work in determining the air/fuel ratio of the vehicle, while the downstream sensor is located after your catalytic converter, and it’s there to monitor exactly how your converter is performing

    MichaelHRitzel